Extension scaffold



Aug. 11, 1925. 1,549,270

} A. LA BER EXTENSION SCAFFOLD Filed May 10, 1924 2 Sheets-Sheet 1 I v Av 2s {inventor A. LABER EXTENSION SCAFFOLD Aug. 11, 1925. 1,549,270

Filed May 1 1924 2 Sheets-Sheet 2 I vi -lng. iii, 1225.,

near

erase AUGUST ABER, or BALTIMORE, MARYLAND.

EXTENSION SGAFFOLD.

Application filed May 1 92%. Serial No. 712,179.

vented certain new and usefullmprovements f in Extension scaffolds, ofwhich the follow ing is a specification.

This invention relates to portable scaf folds such as are used bypainters, masons and other workmen in the construction of buildings andthe like.

One important object of the invention is to improve the generalconstruction of devices of this character. 7

A second important, object of the invention is to provide animproved'means for securing such scaffolds to the walls of a building orthe like. i

A third important object of the invention is to provide novel means forsecuring the horizontal and vertical members of such scaffolds together.

With the above and other objects in view as will be hereinafterapparent, the invention consists in general of certain novel details ofconstruction and combinations of parts hereinafter fully described,illustrated in the accompanying drawings and specifically claimed.

Gn the accompanying drawings like charactors of reference indicate likeparts in the several views, and:

Figure 1 is a front elevation of a portion of such a scaifold asarranged for painting the corner of a house.

Figure 2 is a perspective view of a portion of a corner upright andshowing certain of the horizontal members.

Figure 3 is a detail section on the line 83 of Figure 1.

Figure l is a detail section on the line l i of Figure 1.

Figure 5 is a detail section on the line 55 of Figure 1.

Figure 6 is a detail, partly in section, showing an end of one of theextensible window struts used herewith.

In carrying out the invention, in the form here disclosed, there isshown a series of uprights each preferably consisting of a ladder. Theseladders are here shown as having continuous side members 10 and rungs 11but it is obvious that each ladder may be made in suitable lengthsconnected. together, such construction being very common in the art andnot necessary here to be shown as no particular claim is made to the useof such sectional or extension lad ders. i

I in order to secure these uprights to the sides of the buildingthe-stiles or sides 10 of tie ladders are supplied with suitable clampsor grips each of which may be formed of a length of bar metal bent atone: end to an approximate U-shape grip 12 and at right angles to one ofthe legs of the U extends a shank 13 terminating in an outwardlyextending flange 1 1. These grips are arranged in confronting pairs sothat the side or stile 10 may be engaged between the U-shaped enos 12 ofsuch a pair. In the shank portion are provided registering openings 15for the reception of a holding bolt 16. A straight strut or tie bar 17may be employed in connection with this clamp, the holding bolt passingthrough a suitable opening in an end of said tie bar located between theshanks 13 of a pair of grips, this form being used when ever the uprightis located directly in front of the side edge of a window opening. Ifthe upright is offset from such opening an angled strut or tie bar 18 isemployed which is provided with spaced bolt openings 19 adjacent one endso that securing bolts 20 may be passed through these openings andthrough openings 21 in the flanges 14. It is obvious that the tie barsmay be bent to different shapes to pass obstructions, reach aroundcorners and the like.

111 order to secure these tie bars to the building extensible brace rodsare employed each of which includes a centrally disposed turnbuckle 22and two screw bars 23. Each screw bar has a pointed end 24 which engagesa suitable opening in a stop plate 25, the opening being of such size asto receive the point without permitting such projection thereof as tomaterially injure the frame of a window in which the device is placed.One of these screw bars passes through a suitable opening 26 in a tiebar and, when the brace rods are placed in position in a window frameand the screw rods extended by turning the turn-buckle, thus securingthe tie bar firmly to the building.

The horizontal members or planks 27 are supported on the rungs l1 andare held from longitudinal movement by hook bolts 28 passing throughopenings in the planks and nuts 29. These hook bolts preferably havetheir hooks at the lower ends and these hooks engage beneath a rung ofthe ladder as shown. Preferably the hook bolts are of sufiicient lengthto match up to the next set of planks so that all the planks between thetop and bottom levels are tied down by a downwardly extending hook boltand held from longitudinal movement by an upwardly extending hook bolt.7

At corners one of the planks meeting the corner upright rests on theother plank and extends at right angles thereto being notched as at 80to receive the ladder stiles or sides and to permit a portion of suchplank to extend between, said stiles so the hook bolts may passtherethrougl'i. Guard rails 31 may also be provided'as shown.

ItJwill be seen that the construction just described provides a readilyportable and entirely safe scaffold which can be easily erected; orremoved.

There has thus been provided a simple and efficient device of the kinddescribed and for the purpose specified. a a

It isobvious that minor changes may be made in the form and constructionof the invention without departing from the. mate rial spirit thereof,It is not, therefore, desired to. confine the invention to the exactform herein shown and described, but it is desired to include all suchas properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is:

1. In a scafiold, the combination of two approximately parallel uprightladders, a. plurality of platform planks resting one above the other inspaced relation on vertically spaced rungs of the ladders, and a meansfor tying two of the planks toe gether and one plank to the ladder rungon which it rests.

2. In a scaffold, the combination of two approximately parallel uprightladders, a plurality of platiorm planks resting one above the other inspaced relation on vertically spaced rungs of the ladders, and a meansfor tying two ofthe planks together and one plank to the ladder rung onwhich it rests, said means comprising a hook bolt passing verticallythrough two of the planks and having a hook on its lower end engagingtherung on which the lower plank rests and a nut on its upper endresting on top of the upper plank;

In testimony whereof I afiix my signature.

AUGUST LABER.

